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Troubleshooting

Fix invalid JSON in an MCP config file

One stray character makes the whole MCP config unreadable, so every server in it disappears. The usual culprits are trailing commas, single quotes, missing braces when merging two configs, and unescaped backslashes in Windows paths.

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Why it happens

  • A trailing comma after the last item.
  • Single quotes instead of double quotes.
  • Two "mcpServers" blocks after pasting a new server.
  • Windows paths with single backslashes.

How to fix it

  1. 1

    Merge into one block

    There must be one "mcpServers" object. Put each server inside it, separated by commas.

  2. 2

    Escape Windows paths

    Write C:\\Users\\you or use forward slashes C:/Users/you.

  3. 3

    Validate before saving

    Paste the file into a JSON validator, or open it in VS Code, which underlines errors.

Still stuck? Every server page on this site shows the exact config for each app. Find your server.